Bearing mounting



Oct. 1, 1935. R.-L. BROWN.

' BEARING noun-um Filed Kay 4;, 1935 INVENTOQ: B RAYMOND [.Beoww,

H15 ATTOF-ZNE).

I Patented Oct. 1,1935

6 1y adapted for high speed spindles.

UNITED srATEs.

PIATEN'T OFFICE sesame MOUNTING Raymond L. Brown, Harwinton, Conm,assignor,

by mesne assignments, to General Motors Corporation, Detroit, Micln, acorporation of Delaware Application May 4, 1933, Serial No. 669,419

11 Claims. (01. sot-184) This invention relates to bearing mountings andcomprises all of the features of novelty herein disclosed. Anobject ofthe invention is to provide an improved bearing mounting especial-Another object is to provide a cushioned bearing mounting for relativelyrotatable members such that vibration and shock loads will be damped andthe bearings will have an initial thrust load.

To these ends and also to improve generally upon devices of thischaracter, the invention consists in the various matters hereinafterdescribed and claimed. In its broader aspects, the invention is notnecessarily limited to the specific constructions selected forillustrative purposes in the accompanying drawing in which i Fig. 1 is acentral sectional view of the mount- Fig. Ms a sectional view indicatinga modification.

The numeral 2 indicates a spindle frame orrail whichsupports a yieldingpad or cushion 4 which is conveniently made of one or more rubber discsto damp or absorb vibration of a bolster case 6. The bolster case hasthe usual threaded shank 8 and a nut ill for securing the case to therail, 9. pin l2 locking the case positively from rotation. A motorcasing I4 has a skirt or flange i6 suitably secured to the bolster case6. Laminations l8 having field windings 20 fit inside the motor casingand are clamped between a shoulder 22 and a ring 24 which is secured tothe casing by screws. The laminations have a clearance at 26 with anarmature 28 which is secured to a blade or spindle 30 supported forhighspeed rotation on a vertical axis. The upper end of the spindle isadapted to carry a bucket (not shown) which contains a varying amount ofrayon yarn 'or the like.

The lower portion of the spindle has a shoulder or abutment 32 againstwhich rests an inner race ring 34 of an antifriction bearing havingrolling elements in the. form of balls 36. The inner race ringpreferably has a press fit on the spindle and an outer race ring 38 issimilarly press-fitted in a sleeveor bearing housing 40 against a flangeor abutment 42 thereof. The bearing has suitable seals 43 at both sidesto retain grease. Externally the housing 40 is pro--. vided with anabutment or shoulder 44 and, below the shoulder, the housing is slightlytapered to facilitate the application of a 'pad or yielding cushion 46.The cushion is preferably made of comparatively soft rubber in the formof a ringv or sleeve supported at its lower end against an abutment orshoulder 48 formed on an annular projection 50 which fits the peripheryof the cushion. I

Near the upper portion of the motor casing H, the spindle has anabutment or shoulder 54 5 supporting an inner race ring 58 of anantifriction bearing 58.. Suitable grease seals 80 are 1 carried by anouter race ring 62 of the bearing which fits in a bearing housing 64against an abutment or shoulder 66 thereof.* Both race 10 ringspreferably have press-fits. The bearing housing 64' has an externalabutment or shoulder 68 and a slightly tapered periphery engaging a pador yielding cushion 10 which fits in an opening of the motor casing. Thecushion 15 .is held under some compression by an annular abutment orprojection 12 on a clamping plate 14 which is fastened by screws 16 in arecess' of the motor casing. If desired, the amount of compression maybe varied, as by inserting azo washer 15 of selected thickness betweenthe abutment l2 and the cushion, or by inserting a washer I! under theplate I4, the washers desirably being of difierent thicknesses for fineradjustment. A gasket 18 engaging the plate I4 25 and the end of themotor casing is clamped by a cover plate 80 having an internallythreaded flange 82 screwed on the motor casing. The cover plate 80 hasan extension 84 with an opening for the spindle and this opening iscovered 80 by a skirt or deflector 86 to exclude acidor other foreignmatter. I

The exterior of the bearing housing 64 has a clearance at its ends withthe clamping plate I4 and with the casing, and such clearance isdesirably a little less than that between the. armature 28 and thelaminations l8. The exterior oi? the lower bearing housing also has lessclearance with the surrounding parts than that between armature 28 andlaminations l8. This 40 will guard against any possible contact of thearmature and laminations. The upper bearing and the upper cushion'areshown larger than the lower bearing and itscushion but this is notessential. Compression of the upper cushion will e!- fect a compressionof the lower one and the slight resultant endwise shifting of the outerrace rings 'will produce some preloading of the bearings dial shockloads acting between the spindle and the casing so protect the bearings.The cushions also apply an initial thrust load to the bearings and thisis advantageous in preventing radial looseness.

Any vertical spindle rotating at certain high speeds tends to find itsown gyroscopic center like a top but, at other speeds, there is atendency, due to lack-of balance, for a slender spindle Journalled onspaced bearings to bow or bend and transmit shock and vibration to thebearings and their supporting casing. Lack of balance in the presentspindle itself will be very small but the lack of balance may beaggravated by the bucket or other variable load carried at its upper orunsupported end. Shock loads and vibrations are absorbed by thecushions; thus protecting the bearings, and the comparatively softcushioning material will also allow some lateral shifting of the bearinghousings thereby aiding the spindle in finding its own proper axis ofrotation. The cushions, being under axial as well as radial compression,also apply the advantageous initial thrust load which, in the presentembodiment, is eil'ected by a tendency to urge the outer race rings ofthe bearing axially towardsone another while the inner race rings remainfixed on the spindle.

In Fig. 2 is indicated a modification wherein the flanged bearinghousings or sleeves are omitted and the abutments-for the cushions aresupplied by a ring 680. or a fixed to the outer race ring. Such ring 68aor a is conveniently a split ring with a rib 90 entering a holdinggroove in the race ring so that the ring becomes in effect an integralflange on the bearing.

I claim:

1. In a device of the character indicated, a spindle, a casing, a pairof thrust and radial load bearings between the spindle and the casing, apair of cushions between the spindle and the casing, each bearing andone of the cushions being arranzed one outside of the other to relievethe bearings of radial shock loads acting between the' spindle and thecasing, each bearing having one of its race rings held from axialmovement with respect to the corresponding race ring of the otherbearing, the remaining race rings being relatively shiftable, and meansfor compressing the cushions to urge said remaining race rings to haverelative axial shifting and thereby apply thrust loads to the bearings;substantially as described.

2. In a device of the character indicated, a spindle, a casing, a. pairof thrust and radial load bearings on the spindle, a cushion betweeneach bearing and the casing to damp radial shock loads, and means forcompressing the cushion to apply initial thrust loads to the bearings;substantially as described.

3. In a device of the character indicated, a

spindle, a casing, a pair of thrust and radial load bearings havingtheir inner race rings fixed on the spindle, a cushion between the outerrace ring of each bearing and the casing to damp radial shock loads, andmeans acting through the cushion to efiect a relative axiaL movementbetween the outer race rings to apply thrust loads tothe bearings;substantially as described.

4. In a device of the character indicated, a spindle having a pair ofabutments, a casing having a pair of abutments, a pair of thrust andradial load bearings between the spindle and the casing, a pair ofcushions between the spindle and the casing, each bearing and one of thecushions'being arranged one outside of the other to relieve the bearingsof radial shock loads acting between the spindle and the casing, theoutspindle having a pair of abutments, a casing having a pair ofabutments, a pair,of thrust and radial load bearings between the spindleand the 15 casing, a pair of cushions between the spindle and thecasing, each bearing and one of the cushions being arranged one outsideof the other to relieve the bearings of radial shock loads actingbetween the spindle and the casing, the outside memo ber of eachassociated bearing and cushion engaging at one end with one of thecasing abutments and the inside member engaging at one end with one ofthe spindle abutments, the casing abutment and the spindle abutmentfacing in 25 opposite directions, a sleeve interposed between eachbearing and cushion and having abutments engaging each of saidassociated members whereby compression of the cushions will apply aninitial thrust load to the bearings; substantially 0 as described.

6. In a device of the character indicated, a spindle having a pair ofabutments, a casing having a pair of abutments, a pair of thrust andradial load bearings, each engaging one of the 35 spindle abutments,cushions between each bearing and the casing to relieve the bearings ofradial shock loads, each cushion engaging one of the casing abutments,and an abutment carried by each bearing and engaging one of the cushionsin opposition to one of the casing abutments, and the bearing-carriedabutments being capable of relative axial movement whereby compressionof the cushions will apply a thrust load to the bearings; substantiallyas described. 45 ,7. In a device of the character indicated, a spindlehaving a pair of abutments, a casing having a pair of abutments, a pairof thrust and radial load, bearings between the spindle and the casing,a pair of separated sleeves between the 50 spindle and the casing,cushions between the spindle and the casing to damp radial shock loadstherebetween, each sleeve having a bearing-engaging abutment facing inone direction and a cushion-engaging abutment facing in an oppositedirection, and each sleeve having one of its abutments opposing one ofthe spindle abutments and having its other abutment opposing one of thecasing abutments; substantially as described.

8. In a device of the character indicated, a spindle, a casing, thrustand radial load bearings on the spindle, a pair of separated bearinghousings each containing one of the bearings, cushions interposedbetween the bearing housings and the casing to damp radial shock load,each bearing 05 housing having aninwardly projecting bearingengagingabutment at one end and an outwardly projecting cushion-engagingabutment at the other end, the casing having abutments engaging thecushions in axial opposition to the abutments 70 on the bearinghousings, and the bearing engaging abutments on the bearing housingsfacing in opposite directions; substantially as described.

9. In a device of the character indicated, a spindle, a casing, anantifriction bearing between 75 the spindle andthe casing, a cushionbetween the spindle and the casing, the bearing and the cushion beingarranged one outside of the other to relieve the bearings of shock load.the bearing having a groove in one of its race rings, a ring projectingfrom the groove and engaging one end of the cushion, and means acting inopposition to said ring to effect adjustment oithe compression oithecushion; substantially as described. h

10. In a device of the character described, a spindle, a casing, a pair0! spaced-apart antitriction bearings between the spindle and thecasing, bearing housings between the bearings and the casing, cushionsinterposed directly between and engaging the bearing housings and thecasing, the bearing housings having small circumferential clearance withthe casing, the

clearance being less than that between any cas-' ing-carried parts andany parts which rotate with the spindle so that the bearing housings andthe casing can engage one another to prevent engagement of anyrelatively rotatable parts; substantially as described.

, 11. In a device of the character described, a spindle, a casing, apair of spaced-apart antiiriction bearings between the spindle and thecasing, a sleeve surrounding at least one of bearings and having anabutment, the casing having an opposing abutment, a cushion between thecasing and the sleeve and interposed between the abutments, and meansfor forcing one of the race rings of the remaining bearing axially with15 respect to the spindle to compress said cushion and preload thebearings; substantially as described.

' RAYMOND L. BROWN.

the 10 l

